Design and develop a JavaScript function that can get the shortest possible path from a destination X to destination Y if there is any.
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In order to develop a JavaScript function which can get the shortest path between two destinations, first of all, we need to think about the proper data structure which can represent these places and the connections between them. If we think about it, we will find that these placed can be represented as nodes and the connections between these places can be represented as edges which is typically a Graph. We can represent this Graph as a 2D N X N array as shown below.

After make the proper representation, we need to think about how to get the shortest path between any two nodes in this unweighted graph. Since this graph is unweighted, we can use directly BFS (Breath First Search) in order to get the shortest path. For more information about BFS, check: https://en.wikipedia.org/wiki/Breadth-first_search.

In order to implement BFS, there are some notes for our implementation below:

We utilized the Queue data structure for storing the nodes in a first-in, first-out (FIFO) style, we explore the oldest unexplored nodes first. Thus our explorations radiate out slowly from the starting node, defining a breadth-first search.

In order to keep track of the shortest path, we have a JavaScript map nodeParent object which stores the first visited parent of the current visited node.

Finally, when the search finds the destination then we construct the final path from the nodeParent object and stores it in the finalPath array.

The code below shows our BFS implementation in order to get the shortest path between the start and destination nodes.